You're comparing apples to oranges. You do not drive 200+ mph and the harnesses that race car drivers wear are very different from the one in your child's car seat. They have HANS devices and 6 point harnesses just to name two differences.

Quote:

Originally Posted by Mom2Connor

Race car drives have HANS to prevent head excursion. The theory is that for a child mature enough to be boostered, the seatbelt allows head, neck/spine to move together, as opposed to the head snapping forward by itself.

Obviously in OPs case a harness would be safer than improperly boostering.

This is the theory I subscribe to but since we don't have any evidence either way, it's just a theory. The properly used seat wins every time, that we do know.

Quote:

Originally Posted by NotLad

So do astronauts

Not even close to a fair comparison. Astronauts travel at speeds that no car could achieve.